CN104259407B - A kind of rising head thermal-insulating covering agent and preparation method thereof - Google Patents
A kind of rising head thermal-insulating covering agent and preparation method thereof Download PDFInfo
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- CN104259407B CN104259407B CN201410523337.0A CN201410523337A CN104259407B CN 104259407 B CN104259407 B CN 104259407B CN 201410523337 A CN201410523337 A CN 201410523337A CN 104259407 B CN104259407 B CN 104259407B
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- rising head
- insulating covering
- covering agent
- coverture
- head thermal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Thermal Insulation (AREA)
- Ceramic Products (AREA)
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Abstract
The invention discloses a kind of rising head thermal-insulating covering agent and preparation method thereof.Coverture is made up of the raw material of following parts by weight meter: expanded perlite 16-24 part, rice husk 6-9 part, magnesium powder 2-4 part, silica flour 6-12 part, alumina silicate fibre 21-28 part, calcium oxide 11-15 part, graphite powder 14-17 part, sodium carboxymethyl cellulose 5-8 part and soda 3-6 part；200 sieves all crossed by described raw material.The rising head of the present invention is simple with thermal-insulating covering agent preparation, easy to use, adding from rising head, magnesium powder and silica flour one work, and can play good insulation effect, and there is the function absorbing field trash, coverture its viscosity after testing of the present invention is 0.5-1.5Pa*s simultaneously, and expansion multiple is 1.1-1.3, and at 1500 DEG C, fusing time is 10-15s, rational expansion multiple and fusing time make coverture form a heat-insulation layer after putting into rising head, increase heat insulation effect.
Description
Technical field
The present invention relates to a kind of rising head thermal-insulating covering agent and preparation method thereof, belong to foundary industry technical field.
Background technology
In Foundry Production, the setting time for extending rising head inner metal liquid covers the covering material on riser metal liquid surface coverture.Covering flux is invested among rising head so that it is being covered in can on rising head molten steel
Extend rising head top investing time, make molten steel in rising head be in for a long time under atmospheric pressure effect, substantially increase the feeding efficiency of rising head, be conducive to the gas in foundry goods and inclusion floating, reach to purify the purpose of molten steel, and obtained sound steel part, reduce percent defective.
Application number be 201210232505.1 patent application document " a kind of thermal-insulating covering agent " disclose a kind of thermal-insulating covering agent.The each composition weight proportioning of coverture is metallic aluminium powder 5-8%；Boron nitride powder 15-30%；Sodium nitrate 5-15%；Modified expanded perlite 25-35%；Rice husk ash 15-30%；Metal magnesium powder 10-18%；Fluorspar Powder 5-8%.This coverture emission capacity is good, but exothermic process is quick, have impact on the heat insulation effect of entirety.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of rising head thermal-insulating covering agent and preparation method thereof.
The present invention is achieved through the following technical solutions:
A kind of rising head thermal-insulating covering agent, is made up of the raw material of following parts by weight meter: expanded perlite 16-24 part, rice husk 6-9 part, magnesium powder 2-4 part, silica flour 6-12 part, alumina silicate fibre 21-28 part, calcium oxide 11-15 part, graphite powder 14-17 part, sodium carboxymethyl cellulose 5-8 part and soda 3-6 part；200 sieves all crossed by described raw material.
Described a kind of rising head thermal-insulating covering agent, the weight ratio of described magnesium powder and silica flour is 1:3.
Described a kind of rising head thermal-insulating covering agent, the expansion multiple of described expanded perlite is 12-16, and the content of its silicon dioxide is 72-75%.
Described a kind of rising head thermal-insulating covering agent, described graphite powder is acidifying graphite powder, it is obtained through the following steps: be the concentrated sulphuric acid of 4:1:0.05, graphite and potassium permanganate reaction 20-30min by weight ratio, washing post-drying, broken, acidifying graphite powder can be obtained.
The preparation method of described a kind of rising head thermal-insulating covering agent; the raw material of all mistake 200 mesh sieves is placed in ball mill; wet ball grinding mixes; the weight ratio of its Raw, water and ball is 1:3:5; Ball-milling Time is 2h, is stood by the slurry obtained after dewatering, is placed in baking oven; dry when temperature is 90-110 DEG C, obtain graininess coverture by comminutor.
The preparation method of described a kind of rising head thermal-insulating covering agent, the granularity of the coverture obtained is 60-100 μm.
The beneficial effect that the present invention reaches:
The rising head of the present invention is simple with thermal-insulating covering agent preparation, easy to use, adding from rising head, magnesium powder and silica flour one work, and can play good insulation effect, and there is the function absorbing field trash, coverture its viscosity after testing of the present invention is 0.5-1.5Pa*s simultaneously, and expansion multiple is 1.1-1.3, and at 1500 DEG C, fusing time is 10-15s, rational expansion multiple and fusing time make coverture form a heat-insulation layer after putting into rising head, increase heat insulation effect.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
Embodiment 1
In the present embodiment, a kind of rising head thermal-insulating covering agent, is made up of the raw material of following parts by weight meter: expanded perlite 24 parts, 6 parts of rice husk, magnesium powder 2 parts, silica flour 6 parts, alumina silicate fibre 28 parts, calcium oxide 11 parts, graphite powder 17 parts, sodium carboxymethyl cellulose 5 parts and 6 parts of soda；200 sieves all crossed by described raw material.
Wherein, the expansion multiple of described expanded perlite is 16, and the content of its silicon dioxide is 75%.Described graphite powder is acidifying graphite powder, is obtained through the following steps: be the concentrated sulphuric acid of 4:1:0.05, graphite and potassium permanganate reaction 20min by weight ratio, washing post-drying, broken, can obtain acidifying graphite powder.
The preparation method of described a kind of rising head thermal-insulating covering agent; the raw material of all mistake 200 mesh sieves is placed in ball mill; wet ball grinding mixes; the weight ratio of its Raw, water and ball is 1:3:5; Ball-milling Time is 2h, is stood by the slurry obtained after dewatering, is placed in baking oven; dry when temperature is 110 DEG C, obtain graininess coverture by comminutor.The granularity of the coverture obtained is 60 μm.
In the present embodiment, the viscosity of coverture is 0.5Pa*s after testing, and popping fold is 1.3, and the fusing time at 1500 DEG C is 10s.The coefficient of expansion of the graphite powder after acidified improves, and improves the expansion multiple of coverture, and the granularity of coverture is 60 μm, it is ensured that the uniformity of coverture, further increases the heat insulation effect of coverture.
Embodiment 2
In the present embodiment, a kind of rising head thermal-insulating covering agent, is made up of the raw material of following parts by weight meter: expanded perlite 16 parts, 9 parts of rice husk, magnesium powder 4 parts, silica flour 12 parts, alumina silicate fibre 21 parts, calcium oxide 15 parts, graphite powder 14 parts, sodium carboxymethyl cellulose 8 parts and 3 parts of soda；200 sieves all crossed by described raw material.
Wherein, the expansion multiple of described expanded perlite is 12, and the content of its silicon dioxide is 72%.Described a kind of rising head thermal-insulating covering agent, described graphite powder is acidifying graphite powder, is obtained through the following steps: be the concentrated sulphuric acid of 4:1:0.05, graphite and potassium permanganate reaction 30min by weight ratio, washing post-drying, broken, can obtain acidifying graphite powder.
The preparation method of described a kind of rising head thermal-insulating covering agent; the raw material of all mistake 200 mesh sieves is placed in ball mill; wet ball grinding mixes; the weight ratio of its Raw, water and ball is 1:3:5; Ball-milling Time is 2h, is stood by the slurry obtained after dewatering, is placed in baking oven; dry when temperature is 90 DEG C, obtain graininess coverture by comminutor.The granularity of the coverture obtained is 100 μm.
In the present embodiment, the viscosity of coverture is 1.5Pa*s after testing, and popping fold is 1.1, and the fusing time at 1500 DEG C is 15s.The coefficient of expansion of the graphite powder after acidified improves, and improves the expansion multiple of coverture, and the granularity of coverture is 100 μm, it is ensured that the uniformity of coverture, further increases the heat insulation effect of coverture.
Embodiment 3
In the present embodiment, a kind of rising head thermal-insulating covering agent, is made up of the raw material of following parts by weight meter: expanded perlite 22 parts, 7 parts of rice husk, magnesium powder 3 parts, silica flour 9 parts, alumina silicate fibre 24 parts, calcium oxide 13 parts, graphite powder 15 parts, sodium carboxymethyl cellulose 7 parts and 4 parts of soda；200 sieves all crossed by described raw material.
Wherein, the expansion multiple of described expanded perlite is 14, and the content of its silicon dioxide is 74%.Described graphite powder is acidifying graphite powder, is obtained through the following steps: be the concentrated sulphuric acid of 4:1:0.05, graphite and potassium permanganate reaction 20min by weight ratio, washing post-drying, broken, can obtain acidifying graphite powder.
The preparation method of described a kind of rising head thermal-insulating covering agent; the raw material of all mistake 200 mesh sieves is placed in ball mill; wet ball grinding mixes; the weight ratio of its Raw, water and ball is 1:3:5; Ball-milling Time is 2h, is stood by the slurry obtained after dewatering, is placed in baking oven; dry when temperature is 110 DEG C, obtain graininess coverture by comminutor.The granularity of the coverture obtained is 65 μm.
In the present embodiment, the viscosity of coverture is 0.9Pa*s after testing, and popping fold is 1.2, and the fusing time at 1500 DEG C is 12s.The coefficient of expansion of the graphite powder after acidified improves, and improves the expansion multiple of coverture, and the granularity of coverture is 65 μm, it is ensured that the uniformity of coverture, further increases the heat insulation effect of coverture.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.
Claims (6)
1. a rising head thermal-insulating covering agent, it is characterized in that, be made up of the raw material of following parts by weight meter: expanded perlite 16-24 part, rice husk 6-9 part, magnesium powder 2-4 part, silica flour 6-12 part, alumina silicate fibre 21-28 part, calcium oxide 11-15 part, graphite powder 14-17 part, sodium carboxymethyl cellulose 5-8 part and soda 3-6 part；200 sieves all crossed by described raw material.
2. a kind of rising head thermal-insulating covering agent according to claim 1, is characterized in that, the weight ratio of described magnesium powder and silica flour is 1:3.
3. a kind of rising head thermal-insulating covering agent according to claim 1, is characterized in that, the expansion multiple of described expanded perlite is 12-16, and the content of its silicon dioxide is 72-75%.
4. a kind of rising head thermal-insulating covering agent according to claim 1, it is characterized in that, described graphite powder is acidifying graphite powder, be obtained through the following steps: by weight ratio be the concentrated sulphuric acid of 4:1:0.05, graphite and potassium permanganate reaction 20-30min, wash post-drying, crush, acidifying graphite powder can be obtained.
5. the preparation method of a kind of rising head thermal-insulating covering agent according to claim 1; it is characterized in that; the raw material of all mistake 200 mesh sieves is placed in ball mill; wet ball grinding mixes, and the weight ratio of its Raw, water and ball is 1:3:5, and Ball-milling Time is 2h; the slurry obtained is stood after dewatering; it is placed in baking oven, dries when temperature is 90-110 DEG C, obtain graininess coverture by comminutor.
6. the preparation method of a kind of rising head thermal-insulating covering agent according to claim 5, is characterized in that, the granularity of the coverture obtained is 60-100 μm.
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| CN201410523337.0A CN104259407B (en) | 2014-10-08 | 2014-10-08 | A kind of rising head thermal-insulating covering agent and preparation method thereof |
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| CN108436069A (en) * | 2018-02-05 | 2018-08-24 | 霍山县东胜铸造材料有限公司 | A kind of casting ladle based on thermal insulation material |
| CN109534766B (en) * | 2018-10-29 | 2020-09-04 | 郑州远东耐火材料有限公司 | Environment-friendly covering agent for insulating riser of fused brick and preparation method thereof |
| CN109777916A (en) * | 2018-11-27 | 2019-05-21 | 沈劲松 | For improving the metallurgical industry heat preservation earthing of metal product toughness |
| CN112813227B (en) * | 2020-12-22 | 2022-11-15 | 中钢集团邢台机械轧辊有限公司 | Method for removing dust by using electric furnace |
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| EP2407563A1 (en) * | 2010-07-13 | 2012-01-18 | Denain Anzin Métallurgie D.A.MET | Covering powder for liquid steel and method for manufacturing same |
| CN103320573B (en) * | 2012-03-23 | 2015-07-22 | 宝山钢铁股份有限公司 | Application of desulfurized injection residues of LF furnace and thermal insulating agent prepared by desulfurization injection residues of LF furnace |
| CN102618694B (en) * | 2012-03-31 | 2014-03-12 | 芜湖县天海耐火炉料有限公司 | Refining heat insulation covering agent and preparation method thereof |
| CN103231034A (en) * | 2013-04-09 | 2013-08-07 | 宣全 | Rice hull ash composite covering agent |
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